Brake-applying means



May 22, 1928;

K. E. LYMAN BRAKE APPLYING MEANS Filed June 1927 2 Sheets-Sheet M715? KENNETH E. LYMAN May 22, 1928. 1,670,730

K. E. LYMAN v BRAKE APPLYING MEANS Filed June 7, 1927 2 Sheets-Sheet 2 KENNETH E.LYMAN Patented May 22, 1 928.

UNITED STATES PATENT OFFICE.

KENNETH E. LYIAN, OI CHICAGO, ILLINOIS, ASSIGNOB TO BENDIX BRAKE COMPANY, 01 CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

BRAKE-APPLYING MEANS.

Application fled June 7,

This invention relates to brakes, and is illustrated as embodied in a front wheel brake for an automobile. An object of the invention is to provide a simple and inexpensive but very strong 0 rating mechanism for the brake, includinga novel universal joint substantially at the swivelling axis of the wheel.

In one desirable arrangement, the operating shaft and thecamshaft have novel interen ging thrust parts forming the joint, and s own as hemisphericalportions havin their edges cut away to form the described thrust parts. Preferably the hemispherical portions are urged apart by a spring, axial ly of the shafts, against an outer ousing.

The above and other features of the invention willbe apparent from the following description of one illustrative embodiment shlgwlrll in the accompanying drawing, in w 10 Figure 1 is a vertical section through the brake and associated parts, showing the shafts in front elevation;

Figure 2 is a view of part of Figure 1 on a larger scale;

Fi re 3 is a section through the joint on the line 3-3 of Figure 2;

Figure 4 is a rspective view of the inner end of the cams aft; and

Figure 5 is a perspective view of the outer end of the operatingshaft.

The illustrated brake includes a drum 10, rotating with a wheel (not shown) mounted on. the spindle 12 of a knuckle 14, which knuckle is swivelled by a king-pin 16or the like at one end of an axle 18. Axle 18 supports a chassis frame 20 through the usual springs 22.

The friction means of the brake is illustratedas comprising shoes 24, carried by a backin plate 26 mounted on the knuckle 14, an operated by means such as a cam 28 having a shaft 30. Shaft 30 is journalled in a bushing 32 of graphite bronze or the like, carried by two steel lates 34secured in any desired manner to t e backin plate 26.

The camshaft 30 is opera through a novel joint above the kin -pin 16 in the swivelling axis of the whee by an 0 anting shaft 36 having an arm 38 and shdably and universally sup rted at its inner end by a support 40 earned by the chassis frame 20 Shaft 30 is formed, or has secured there- 187. Serial No. 197,178.

to, at its inner end, a hemispherical portion 42 cut away at its edge to form straight thrust surfaces 44 on opposite sides of and parallelin the shaft axis.

Similar y, shaft 36 has at its outer end a hemispherical portion 46, cut away at its edge to form thrust fingers 48 extending circumferentially of the joint and engaging at their ends with the surfaces 44.

Preferably a spring 50 housed within the joint urges the hemispherical portions 42 and 46 apart against a spherical housing formed by stampings 52 carried by the backing plate 26. Housin 52 is preferably in sections which can sli e upon each other.

In operation, thrust is transmitted from the projections or fingers 48 to the surfaces 44 to turn the shaft 30. When the shafts move relatively about a horizontal axis, due to the action of springs 22, projections 48 merel roll slightly on surfaces 44. In swive ling the w leel to round a corner, surfaces 44 slide on the projections 48.

While one illustrative embodiment has been described in detail, it is not my intention.to limit the scope of the invention to that particular embodiment, or otherwise than by the terms of the appended claims.

I claim:

1. Operatin means for a brake on a swivelled whee comprising a pair of shafts arranged end to end and having a joint substantially at the swivelling axis of the wheel, which joint includesthrust surfaces on one shaft on op osite sides of and paralleling the axis of t e shaft, and rejecting thrust portions on the othersha t engaging said surfaces.

2. Operating means for a brake on a swivelled wheel comprising a pair of shafts arranged end to end and having a joint substantially at the swivelling axis of the wheel, which joint includes thrust surfaces on one shaft paralleling the axis of he shaft, and projecting thrust ortions on t e other shaft engaging said sur aces.

3. Operating means for a brake on a swivelled wheel comprising a pair of shafts arranged end to end and having a joint substantially at the swivelling axis of the wheel, which joint includes inter-engaging thrust portions carried by the shafts and rocking on each other to permit relative movement of the shafts about a horizontal axis and. sliding on each other to permit relative movement of the shafts about a Vertical axis.

4:. Operating means for a brake on a swivelled wheel comprising a pair of shafts arranged end to end and having a joint substantially at the swivelling axis of the Wheel, which joint includes interengaging thrust portions carried by the shafts and rocking on each other and also sliding on each other to permit relative movement of the shafts about vertical and horizontal axes.

5. Operating means for a brake on a swivelled wheel comprising a pair of shafts arranged end to end and having a joint substantially at the swivelling axis of the wheel, which joint includes hemis herical Karts carried by the two shafts an which eve torque-transmitting interengaging portions.

6. Operating means for a brake on a swivelled wheel comprisin a pair of shafts arranged end to end anfi having a joint substantially at the swivelling axis of the wheel, which joint includes hemispherical parts carried by the two shafts and one of which has. horizontal torque-transmitting surfaces on opposite sides of and arallelin the shaft axis and the other 0 which is formed at its edge with 'circumfercntiallyrejecting thrust fingers engaging said suraces.

7. Operating means for a brake on a swivelled wheel comprising a pair of shafts arranged end to end and having a pint substantially at the swivelling axis of the wheel, which joint includes hemispherical arts carried by the two shafts and which ave torque-transmitting interengaging portions, together with a spring between said parts urging them apart axially of the shafts.

8. Operating means for a brake on a swivelled wheel comprisin a pair of shafts arranged end to end and having a joint substantially at the swivelling axis of the wheel, which joint includes hemispherical arts carried by the two shafts and which ave torquetr ansmitting interengaging portions, together with a spring between said parts urging them apart axially of the shafts and a spherical housing against which said parts are urged by the spring.

In testimony whereof, I signed my name.

KENNETH E. LYMAN.

have hereunto 

